You stockpile thermal energy in a magical wheel-like construct that lets you burn opponents with cold or freeze their bodies with heat. When you cast the spell, the wheel has one mote of thermal energy, and when you deal cold or fire damage, the wheel spins, siphoning off a bit of energy and gaining another mote. The wheel can't gain motes more than twice on a given turn, and the maximum number of motes is equal to double the level of the spell slot that was used to cast entropic wheel, up to a maximum of 10 motes when cast with a fifth level spell slot.
When you cast a spell that deals fire damage, the target also takes cold damage equal to double the number of motes in the entropic wheel. When you cast a spell that deals cold damage, the target also takes fire damage equal to double the number of motes in the entropic wheel. This applies only to the initial damage of the spell, not to any ongoing effects.
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